in theory, yes. I have the upgrading mechanic down. Uthur and koke-Kain, for example. 

Evolving some is the issue. I think I'm on track with Coil and Strike, but those could easily just be evolutions. 

To bypass it, I could just have them all be upgrades, but some would get new keys/better keys(Uthur/Koke), and some would effect their state(Coil/Strike).